Data Sheet
August 1999
T7507 Quad PCM Codec with Filters,
Termination Impedance, and Hybrid Balance
Transmission Characteristics
(continued)
ac Transmission Characteristics
(continued)
Table 15. Decoder Limits Relative to Gain at 1020 Hz
Frequency (Hz)
15.6
46.8
62.5
453
2734
3140
3375
3984
5015
Min
–0.150
–0.150
–0.150
–0.150
–0.150
–0.550
–0.850
—
—
Typ
—
—
—
—
—
—
—
—
—
Max
0.150
0.150
0.150
0.150
0.150
0.150
0.150
–13.40
–28.00
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
Table 16. Encoder Limits, Includes Effect of Termination Impedance Filter Relative to Gain at 1020 Hz
Frequency (Hz)
15.6
46.8
62.5
453
2734
3140
3375
3984
5015
Min
—
—
—
0.400
–2.950
–3.950
–4.550
—
—
Typ
—
—
—
—
—
—
—
—
—
Max
–30.500
–25.600
–29.400
0.700
–2.650
–3.250
–3.850
–18.30
–35.00
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
Table 17. Termination Impedance Limits Relative to Gain at 1020 Hz
Frequency (Hz)
46.8
62.5
453
2734
3140
3375
3984
5015
Min
0
0.3
0.45
–2.95
–3.60
–4.05
–5.05
–6.35
Typ
—
—
—
—
—
—
—
—
Max
1
0.8
0.65
–2.65
–3.20
–3.55
–4.45
–5.65
Unit
dB
dB
dB
dB
dB
dB
dB
dB
Table 18. Hybrid Path Limits Relative to Gain at 1020 Hz
Frequency (Hz)
46.8
62.5
453
2734
3140
3375
3984
Min
—
—
–0.180
–0.410
–0.700
–1.640
—
Typ
—
—
—
—
—
—
—
Max
–26.000
–30.000
0.180
–0.050
0.100
–0.840
–25.00
Unit
dB
dB
dB
dB
dB
dB
dB
Lucent Technologies Inc.
19
AGERE [ AGERE SYSTEMS ]
